ERROR opening https://cactus.nci.nih.gov/chemical/structure/COP%28%3DS%29%28OC%29OC1%3DCC%3DC%28C%3DC1%29C%23N/file?format=sdf&get3d=True  -- COP%28%3DS%29%28OC%29OC1%3DCC%3DC%28C%3DC1%29C%23N could not be loaded.